94 lines
3.4 KiB
JavaScript
94 lines
3.4 KiB
JavaScript
import { extname, resolve } from "node:path";
|
|
import { stat } from "node:fs/promises";
|
|
import { BaseDocumentLoader } from "../base.js";
|
|
import { UnknownHandling } from "./directory.js";
|
|
/**
|
|
* A document loader that loads documents from multiple files. It extends the
|
|
* `BaseDocumentLoader` class and implements the `load()` method.
|
|
* @example
|
|
* ```typescript
|
|
*
|
|
* const multiFileLoader = new MultiFileLoader(
|
|
* ["path/to/file1.pdf", "path/to/file2.txt"],
|
|
* {
|
|
* ".pdf": (path: string) => new PDFLoader(path),
|
|
* },
|
|
* );
|
|
*
|
|
* const docs = await multiFileLoader.load();
|
|
* console.log({ docs });
|
|
*
|
|
* ```
|
|
*/
|
|
export class MultiFileLoader extends BaseDocumentLoader {
|
|
constructor(filePaths, loaders, unknown = UnknownHandling.Warn) {
|
|
super();
|
|
Object.defineProperty(this, "filePaths", {
|
|
enumerable: true,
|
|
configurable: true,
|
|
writable: true,
|
|
value: filePaths
|
|
});
|
|
Object.defineProperty(this, "loaders", {
|
|
enumerable: true,
|
|
configurable: true,
|
|
writable: true,
|
|
value: loaders
|
|
});
|
|
Object.defineProperty(this, "unknown", {
|
|
enumerable: true,
|
|
configurable: true,
|
|
writable: true,
|
|
value: unknown
|
|
});
|
|
if (Object.keys(loaders).length === 0) {
|
|
throw new Error("Must provide at least one loader");
|
|
}
|
|
for (const extension in loaders) {
|
|
if (Object.hasOwn(loaders, extension)) {
|
|
if (extension[0] !== ".") {
|
|
throw new Error(`Extension must start with a dot: ${extension}`);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/**
|
|
* Loads the documents from the provided file paths. It checks if the file
|
|
* is a directory and ignores it. If a file is a file, it checks if there
|
|
* is a corresponding loader function for the file extension in the `loaders`
|
|
* mapping. If there is, it loads the documents. If there is no
|
|
* corresponding loader function and `unknown` is set to `Warn`, it logs a
|
|
* warning message. If `unknown` is set to `Error`, it throws an error.
|
|
* @returns A promise that resolves to an array of loaded documents.
|
|
*/
|
|
async load() {
|
|
const documents = [];
|
|
for (const filePath of this.filePaths) {
|
|
const fullPath = resolve(filePath);
|
|
const fileStat = await stat(fullPath);
|
|
if (fileStat.isDirectory()) {
|
|
console.warn(`Ignoring directory: ${fullPath}`);
|
|
continue;
|
|
}
|
|
const loaderFactory = this.loaders[extname(fullPath)];
|
|
if (loaderFactory) {
|
|
const loader = loaderFactory(fullPath);
|
|
documents.push(...(await loader.load()));
|
|
}
|
|
else {
|
|
switch (this.unknown) {
|
|
case UnknownHandling.Ignore:
|
|
break;
|
|
case UnknownHandling.Warn:
|
|
console.warn(`Unknown file type: ${fullPath}`);
|
|
break;
|
|
case UnknownHandling.Error:
|
|
throw new Error(`Unknown file type: ${fullPath}`);
|
|
default:
|
|
throw new Error(`Unknown unknown handling: ${this.unknown}`);
|
|
}
|
|
}
|
|
}
|
|
return documents;
|
|
}
|
|
}
|